/*
 * Copyright (c) 2013, marco.tamburelli@gmail.com
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.bmi.gwt.mi.server.impl;

import java.util.HashMap;

import org.bmi.gwt.mi.shared.communication.ptypes.Param;
import org.bmi.gwt.mi.shared.communication.var.ObjectVar;
import org.bmi.gwt.mi.shared.communication.var.ReturnVar;
import org.bmi.gwt.mi.shared.exceptions.InvalidArgumentException;
import org.bmi.gwt.mi.shared.util.ObjectWrapper;

/**
 * THis class contains a collection of static method required for conversion
 * between objects and parameters of type {@link Param}.
 */
class ParamConverter
{
	static Object[] convertParameters(HashMap<String, ObjectWrapper> objectMap, Param<?>[] params, Class<?>[] argTypes)
			throws InvalidArgumentException
	{
		if (argTypes.length != params.length)
			throw new IllegalArgumentException("Expected parameter number doesn't matche the provided one.");

		Object[] cleaned = new Object[params.length];

		for (int i = 0; i < params.length; i++)
		{
			Object v = ParamUtils.getValue(params[i], argTypes[i]);

			if (v instanceof ObjectVar)
			{
				ObjectVar oVar = (ObjectVar) v;
				String objectId = oVar.getObjectId();

				ObjectWrapper wrapper = objectMap.get(objectId);
				if (wrapper == null)
					throw new InvalidArgumentException("The received object ID '" + objectId
							+ "' was never register on this client");

				cleaned[i] = wrapper.getInstance();
			}
			else
				cleaned[i] = v;
		}

		return cleaned;
	}

	static Object[] convertParameters(HashMap<String, Object> returnValueMap, HashMap<String, ObjectWrapper> objectMap,
			Param<?>[] params, Class<?>[] argTypes) throws InvalidArgumentException
	{
		if (argTypes.length != params.length)
			throw new IllegalArgumentException("Expected parameter number doesn't matche the provided one.");

		Object[] cleaned = new Object[params.length];

		for (int i = 0; i < params.length; i++)
		{
			Object v = ParamUtils.getValue(params[i], argTypes[i]);

			if (v instanceof ReturnVar)
			{
				ReturnVar<?> rVar = (ReturnVar<?>) v;
				cleaned[i] = returnValueMap.get(rVar.getReturnId());
			}
			else if (v instanceof ObjectVar)
			{
				ObjectVar oVar = (ObjectVar) v;
				String objectId = oVar.getObjectId();

				ObjectWrapper wrapper = objectMap.get(objectId);
				if (wrapper == null)
					throw new InvalidArgumentException("The received object ID '" + objectId
							+ "' was never register on this client");

				cleaned[i] = wrapper.getInstance();
			}
			else
				cleaned[i] = v;
		}

		return cleaned;
	}

	/**
	 * Creates an array of parameters from an array of candidate arguments.
	 * 
	 * @param params An array representing a list of parameters.
	 * @return
	 * @throws InvalidArgumentException
	 */
	public static Param<?>[] convertObjects(Object[] params) throws InvalidArgumentException
	{
		Param<?>[] _params = new Param<?>[params.length];

		for (int i = 0; i < params.length; i++)
			_params[i] = ParamUtils.createParameter(params[i]);

		return _params;
	}
}
